Washington zipcode
| City | Washington |
| ZIP Code | 20428 |
| Type | Company/Organization |
| State Code | DC |
| State | District of Columbia |
ZIP code of Washington is 20428. This place is located in District of Columbia state in US. To send any postal service to Washington, you must use 20428 zipcode.
You should avoid following 1 city name of District of Columbia to be used with the ZIP code 20428.
- Civil Aeronautics Board, DC